Parameterization term is very popular in automated testing. Parameterization is the process of passing the different and huge data to the variable from different location. It is using for reusability of test script. Parameterization means is pass multiple values in application for checking the behavior of the application. It’s very useful where required large and different types of data. Assume that you are testing login window and want to different types of email id and password, so for this type of requirements you can use Parameterization.